package com.vincent;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * Servlet Filter implementation class ImageFilter
 */
public class ImageFilter implements Filter {

    public ImageFilter() {
        // TODO Auto-generated constructor stub
    }
    

	public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
		HttpServletRequest req = (HttpServletRequest) request;
		HttpServletResponse res = (HttpServletResponse) response;
		
		String referer = req.getHeader("referer");
		if (referer==null || !referer.contains(req.getServerName())){
			req.getRequestDispatcher("error.jpg").forward(req, response);
		} else {
			chain.doFilter(request, response);
		}
	}

	public void init(FilterConfig fConfig) throws ServletException {
		// TODO Auto-generated method stub
	}

	public void destroy() {
		// TODO Auto-generated method stub
	}
}
